Improvement in furnace-grates



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AM. PHOTO-LITHD. C()A N Y. (OSUN'S PROCESS.)

u l' UNITED STATES PATENT OFFICE.

S. LLOYD VIEGrANDA AND W. BARNEI LE FAN, OF PHILADELPHIA, PA.

IMPROVEMENT IN FU RNACE-GRATES.

Specification forming part of Letters Patent No. 4 [,ISl, dated Jannary.V 1864; antedated December 21, 1863.

To all whom it may concern:

Be it known that we, S. LLOYD Wine-AND and WVM. BARNET LE VAN, of the city of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in the Form of Construction and Manner of Setting Grate-Bars for Furnaces 5 and we do hereby declare that the following is a full and exact description thereof reference being had to the accompanying drawings and the letters of reference marked thereon.

The nature of our` invention consists in so constructing grate-bars that they are retained in proper relative position to each other by means of tenons made seperate from the bars and interposed between them, and ttinginto niortises in the bars, by which means the bars can be more easily cast than when cast with tenons or their equivalents upon one side of l them, vand with less risk ofthe castings being sprung from right lines 5 and our invention further embraces an improved mode of supportinglbars in furnaces so as to make the entire grate-surface 'available for combustion, and at the same time by placing the supports nearer each other, the weight of the bars and superincumbent charge oi'fuel is not so effective in causing detiection in the bars. when they become overheated.

Figure 1 represents a plan. Fig. 2 represents front elevation. Fig. 3 represents a "ertical section lengthwise. Fig. 4 represents a horizontal section through the bars. Fig. 5 represents va transverse section through the bearer. Fig. 6 represents a transverse section through the center of the bars. Figs. 7, 8, 9, l0, and 1l represent the tenons used near the end of the bars. Figs. 12, 13, 14, 15, and 16 represent the tenons used near the center ot' the bars. Figs. 17 to 29 exhibit a modiiication of the form of constructing the tenons and bars. Figs. 30 to 42, inclusive, show another modification of the form of tenons and bars. Figs. 43 to 55, inclusive, illustrate another form of which this invention is susceptible. Figs. 56 to '68, inclusive, represent another form in which the bars and tenons can be made.

The forms of bars and tenons exhibited in the figures numbered from 17 to 68, inclusive, will be understood by any one skilled in the art of making and setting furnace-grates after an explanation of the preceding gures upon simple inspection. We therefore make literal reference onlyto the distinguishing peculiarities of Figs. 17 to 68, they being in all other respects similar and identical in general plan of arrangement with those represented and fully explained in the rst sixteen figures and that part of this specification referring bars are not symmetrical, as when tenons are cast on one side and mortises on the other, they, in cooling after casting, spring or shrink unequally.

To enable others skilled in the art to construct and use our invention, we will proceed to describe in detail its construction and operation.

W'e make in the bars A, A', A, and A in Figs. 3, 4, and 5 mortises (marked b b b, &c.,) and place in these mortises b b b Src., the tenons c c c, Sac., which are shown in detail in Figs. 7 to 16, inclusive. Upon these tenons we sometimes make ii'anges, (marked d d d, &c., in Figs. 7, 8,9, 10, and 11,) which are useful in preserving the draft-spaces for circulation of air between the bars A, A', A, and A" We do not, however, coni-ine ourselves to tenons with flanges, but sometimes, and especially in narrow or thin bars, cast rims c upon the side 'of the bars around the mortises, as is shown in Figs. 30 and 31, and sometimes we use the rims and anges in combination, as in Figs. 17, 18, and 19; neither do we coniine ourselves to the form of tenon shown in Figs. 8, 21, and 34, but sometimes make them as shown in Figs. 47 and 60, and obtain an equivalent effect thereby. It will be seen upon inspect-ion of Fig. 3 that the supports or bearers g and g' are not placed at the ends of the bars, asis usually done, but are p ced under the series of tenons and mortises nd b nearest the end, which series b and b and tenons o care placed far enough from the ends of the bars to permit a circula- Elon of air through the spaces marked ff f Src., in Fig. 1,thus making the entire length of the grates effective for combustion of fuel. It will be seen upon examination of vFig that the bearers or supports are of a form approaching a triangular prism, and, being sup- 1 orted upon one at side, sustain the grating upon the opposite angle, thus permitting a free circulation of air to all parts of the grate. In placing bars of this kindin a furnace it is c nvenient, if the grate, is small to place the bars andwtenons together before placing them in the furnace, and when large it is more convenient to cut oft' that part of the tenon which would occupy a space in outer bar on one or the other side of the furnace, and use a bar Without mcrtises for the last one ofthe series. We do not claim retaining grate-bars in their proper relative positions by means of mortises and tenons; neither do We claim re'- taining hars by means of another piece of metal extending across the series of bars and holding them ltogether 5 but Vhat We do claim is-v 1. Oombiningbars cast With mortises through them with tenons cast separate and placed between them in the manncr,or any equivalent manner, as set forth.

2. Separating the bars by means of Bauges cast or otherwise formed or fixed upon 'the tenons for the purpose of regulating the draftspaces, as shown and described.

3. The supporting-bars of the grate, when constructed and shaped 'substantiallyas above described.

4. The combination of the supporting-bars, constructed as described, with the draft-spaces near the end ofthe grate-bars, when the supportingbars Yare located in relation to the series of tenons and mortises, substantially as above descrived.

5. The combination of rims around the mortises with the tenons, when constructed and arranged substantially as set forth and dcscribed.

S. LLOYD WIEGAND.

' W. BARNET LE VAN.

Witnesses:

JOHN R. BENTLEY, J oHN WHITE. 

